VOLTAMMETRIC DETERMINATION OF RHODAMINE B USING CARBON PASTE ELECTRODE MODIFIED TIO2

• Main Author: Mudarrisah Alamy, Mutia
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/75542
• Institution: Institut Teknologi Bandung

Colorants are present in various types of foods found in the market. Several dangerous dyes are not intended to be used as food additives. These prohibited dyes have been listed in the Regulation of the Minister of Health of the Republic of Indonesia Number 239/MenKes/Per/V/1985, one of which is rhodamine B. Rhodamine B is generally used in the textile, cosmetic, and paper industries because it has advantages such as its attractive color. However, there are still foods containing rhodamine B in the market. The accumulation of rhodamine B in the body is dangerous because it is carcinogenic, and causes enlargement of the liver and kidneys, as well as physiological disorders of the body. Therefore, a highly sensitive method for rhodamine B analysis is required. In this study, a voltammetric analysis method was developed using a modified TiO2 carbon paste electrode (EPK) for the detection of rhodamine B. TiO2 was chosen because it is stable against oxidation reactions and can expand the surface area of the electrode. The results showed that EPK-TiO2 had a better sensitivity for measuring rhodamine B than EPK. In optimizing the manufacturing of electrodes, EPK with a composition of 8% yielded the best results. The optimum conditions for measurement were obtained using cyclic voltammetry technique in 0.1 M phosphate buffer pH 9. The repeated test of one electrode 20 times showed a %RSD of 2.37%, and the reproducibility of the three electrodes showed a %RSD of 1.06%, which indicated EPK- TiO2 had good performance. EPK-TiO2 has a linear range of 1-1,000 µM with a detection limit of 2.18 µM. Scanning rate analysis showed that the process on the surface of the electrode was controlled by the diffusion process. This electrode provided results that were not significantly different from the sample measurements using a UV-Vis spectrophotometer